使用winio对直接访问IO PORT

首先下载winio库，查看readme在vc++下使用，参考写了个0x70读cmos和0x61控制speaker

void io_init()
{
 DWORD dwPortVal;
 DWORD dwPortVal2;
 DWORD dwMemVal;
 char port[128];
 char mem[128];
 char test[128];
  bool bResult;
  HANDLE hPhysicalMemory;
  PBYTE pbLinAddr;

  // Call InitializeWinIo to initialize the WinIo library.

  bResult = InitializeWinIo();

  if (bResult)
  {
    // Under Windows NT/2000/XP, after calling InitializeWinIo,
    // you can call _inp/_outp instead of using GetPortVal/SetPortVal

   OnReadCmos();

   OnSpeakerSound(); 

    // Map physical addresses 0xA0000 - 0xAFFFF into the linear address space
    // of the application. The value returned from the call to MapPhysToLin is
    // a linear address corresponding to physical address 0xA0000. In case of
    // an error, the return value is NULL.

    pbLinAddr = MapPhysToLin((PBYTE)0xA0000, 65536, &hPhysicalMemory);

    if (pbLinAddr)
    {
      // Now we can use pbLinAddr to access physical address 0xA0000

      *pbLinAddr = 10;

      // When you're done with pbLinAddr, call UnmapPhysicalMemory

      UnmapPhysicalMemory(hPhysicalMemory, pbLinAddr);
    }

    // Instead of using MapPhysToLin, we can use GetPhysLong/SetPhysLong
   SetPhysLong((PBYTE)0xA0000, 10);

    GetPhysLong((PBYTE)0xA0000, &dwMemVal);
 sprintf(mem,"%x", dwMemVal);
 write_log(NORMAL_LOG,"%s|%d: %s/n",__FILE__,__LINE__,mem);

    // When you're done using WinIo, call ShutdownWinIo

    ShutdownWinIo();
  }
  else
  {
    printf("Error during initialization of WinIo./n");
    exit(1);
  }
}

// 0x70是CMOS索引端口(只写)
// 0x71是CMOS数据端口
DWORD ReadCmos(DWORD index)
{
 DWORD dwPortVal;

 SetPortVal(0x70,index, 4);

 GetPortVal(0x71, &dwPortVal, 4);

 return dwPortVal;
}

void OnReadCmos()
{
 CString strInfo;
 CString strTmp;
 DWORD data;

 strInfo = "COMS DATA:/r/n";

 // 读出CMOS 128个字节
 for(int i=0;i<128;i++)
 {
  data = ReadCmos(i);
  write_log(NORMAL_LOG,"%s|%d: Byte %02X:/t%02X/r/n",__FILE__,__LINE__,i,data);
  
  strTmp.Format("Byte %02X:/t%02X/r/n", i, data);
  strInfo+=strTmp;
 }
 GetDlgItem(IDC_EDIT)tWindowText(strInfo);

}

void OnSpeakerSound()
{
 // TODO: Add your command handler code here

 // C调

 // 1 = 262 Hz
 Sound(262);
 Sleep(500);
 NoSound();

 // 2 = 288 Hz
 Sound(288);
 Sleep(500);
 NoSound();

 // 3 = 320 Hz
 Sound(320);
 Sleep(500);
 NoSound(); 
}

// 0x61是speaker控制端口
// 0x43是8253/8254定时器控制端口
// 0x42是8253/8254定时器通道2的端口
void CRadioDlg::Sound(DWORD freq ){
 DWORD data;
 if(freq>=20 && freq<=20000)
 {
  freq = 1193181 / freq;

  GetPortVal(0x61, &data, 4);

  if((data & 3) == 0)
  {
   SetPortVal(0x61,data | 3, 4);
   SetPortVal(0x43,0xb6, 4);
  }

  SetPortVal(0x42,(BYTE)(freq%256), 4);
  SetPortVal(0x42,(BYTE)(freq/256), 4);
 }

}
void NoSound( void )

{
  DWORD data;
  GetPortVal(0x61, &data, 1);
  SetPortVal(0x61, data & 0xfc, 1);   
}